Weighing-machine.



PATENTED DEC. 25, 1906.

D. J. CAMPBELL. WEIGHING MACHINE,

APPLICATION FILED JULYZB, 1905.

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DUNCAN J. CAMPBELL, OF ARNPRIOR, ONTARIO, CANADA.

WEIGHING-MACHINE.

Specification of Letters Patent.

Patented Dec. 25, 1906.

Application filed July 22, 1905. Serial No. 270,888.

To all whom, it may concern.-

Be it known that I, DUNCAN J OSEPH CAMP- BELL, a British subject, residing at Arnprior, in the county of Renirew, Province of Ontario, and Dominion of Canada, have invented new and useful Improvements in Veighing- Machines, of which the following is a specification.

My invention relates to weighinganachines of the steelyard character.

The object of my invention is a weighingmachine particularly adapted for the needs of farmers and suited for accurately weighing both small and large objects ranging from a pound or firkin of butter to the heaviest fat cattle and one that can be produced at low cost and is quite portable.

Figure 1 is an elevation of my improved weighingmachine' shown raised-i. 6., with the lever down. Fig. 2 is a vertical trans verse section of the same on line 2 2, Fig. 1. Fig. 3 is part of Fig. 2 with the lever raised and its upper end broken away, the machine (not shown) being lowered and the supposed load down and not suspended. on the balance. Fig. 4 is a top view of a part, partly in section and on a larger scale. F ig, 5 is an elevation of the same part.

The beamAis composed of three arms-one a comparatively deep, heavy, and short central part a with a lighter extension (1 in line therewith, and two parallel lighter arms a a extending from the central part at the other end, joined thereto by an upright limb a and joined at the outer extremities by the curved end a of the lower arm and secured to the upper one by a separable joint with a bolt a All the said arms composing the beam A are formed integrally. The arms a and. a are graduated and carry sliding weights B and B respectively, while a sliding weight B for the purpose of balance is carried on the arm a.

The upper arm a is graduated for small divisions, such as single pounds, and. the lower one for grosser divisions, such as hundredweights.

The substantially integral structure composed of the arms a, a, a and (1 which constitute the scale-beam, is suspended to swing freely in a clevis C, straddling the central part a and provided with eyes 0, which engage knife-edged trunnions a, securedto said central part at right angles thereto and bearing with their knife-edges upon the inner faces of the bottom of said eyes 0. On each side of the trunnion a, but at unequal distances therefrom, is another pair of trunnions a with knife-edges uppermost and in line with. the knife-edge of the trunnions a Upon each of these is suspended a clevis D, with eyes d and carrying a link D. On the link D is suspended a clevis D with eyes (1 engaging knife-edge trunnions e, by which a curved bar E is suspended. Medially be tween the trunnions c is a trunnion c with its knife-edge uppermost and in line with the knife-edge of the trunnion e, and from this is suspended by the eyes (2 a clevis E carrying a hook E Upon this latter hook the object to be weighed will be suspended.

The clevis C has its upper end contracted and shaped into a flat head with an eye, said head fitting between lugsf and being engaged by a pivot-pin F passing removably through said lugs and head and allowing the clevis to swing in a plane at a right angle to that of the bar A. The lugsf form the lower part of a ring or eye F, and upon it and between the two parts is firmly secured a light bar F in the same vertical plane as the bar A. One end of said bar F extends to the end of the bar a, being bent down to it and forming a loop f, surrounding it, so as to confine its. oscillations to a reasonable limit. The other end of said bar F is balanced with a fixed counterweight f In the above description is comprised the essential part of the balance proper, and it could be suspended by the ring F on any suitable support and would then serve all purposes for weighing comparatively light articles; but to adapt it to more general use and especially for weighing heavy articles, and such as would be diflicult to place upon a suspended, and therefore unsteady, platform, crate, or the like, the apparatus as far as described is suspended from a device for lowering and raising the same without more effort than can be ordinarily exerted by one person. This consists of a stirrup H, Figs. 1, 2, and 3, in the plate 72 of which is secured a swivel-hook Gr, having a head 9, said hook G engaging the eye F. The upper part of the stirrup has its limbs curved backward and also toward each other and brought to bear on the short end i of a long lever I, to which it is jointed by a riveted pin it. The fulcrum of said lever is pivoted between the lower ends of a hanger K by a riveted pivot pin is. The upper end of the hanger is in the shape of an eye or link 76, adapted for suspension on a suitable su port, and the medial portion is bent outwardly to make room for the joint of the lever end and stirrup ends jointed at h 'The lever I is given a suitable curvature backward from the fulcrum to interlock with the stirrup II and hanger K when depressed and the weight raised, and the lever at a little distance from the fulcrum 1c abuts on the stirrup-plate h at a point 5. thus formed a triangle 5 h 7c, of which 5 h may be considered the erect base line which the strains at work are tending to shorten. The upper part of the stirrup H and the lower part of the hanger K must be curved to cooperate with the curves of the lever around its fulcrum, as shown in Figs. 1, 2, and 3. Laterally these parts are curved, as shown in Fig. 1, so that the pivot end 70 of the hanger passes into the stirrup H and the pivot connections of the latter pass through the bulge of the hanger K. The lever is operated by the cord or rope R.

When heavy or difficult objects are to be weighed, the machine is so hung that the platform or crate upon or into which the load is to be placed is resting flat upon the floor or other solid base when the lever I is up, as shown in Fig. 3. hen the load is placed, the platform or crate holding it is readily raised several inches by depressing the lever I into its interlocking position by means of the cord R. (Shown in Figs. 1 and 2.) The tare is counterbalanced on the limb a by the weight B.

I claim as my invention- 1. In a weighing-machine, the combination of a scale-beam having three arms one being non-graduated and having a medial part, a knife-edged trunnion on said medial part on which said beam is suspended, a knife-edged trunnion at each side thereof and at unequal distances therefrom but on the same horizontal line, a pair of clevises suspended from said last-named trunnions, links suspended from said clevises, clevises suspended from said links, a bar having two knife-edged trunnionsengaged by said last named clevises and suspended thereon, a medial knife-edged trunnion on said bar, a clevis with hook suspended from said lastnamed trunnion, a clevis straddling the medial part of the scale-beam and engaging said medial trunnions and having its head pivoted There is between lugs, lugs holding said head pivotally and forming the lower part of an eye or ring, a bar ri "dly secured upon and between said eye and ugs and extending to and form ing a loop around the end of the non-graduated arm of the beam and having its other end counterpoised, and sliding weights on each of the three arms of the beam, substantially as set forth.

2. In a weighing-machine, the combination with a scale-beam and means of suspending the same, of a loop-shaped hanger with eye or link top and with bent-out sides and having its lower ends curved and formed into lug-like bearings, a lever having its short arm bent and passing between the sides of the hanger and its fulcrum pivoted between the ends of the latter within the inner angles of the two arms, a stirrup havin its upper ends bent together and pivotally secured upon the end of the short lever-arm and curved toward the same end, a swivel-hook journaled in the plate of said stirrup from which the scale-beam and its attachments are suspended, the curves of the lever-hanger and stirrup being such that when the lever is depressed its short arm passes through the hanger and overhangs the fulcrum-joint and the fulcrum-joint passes partly between the sides of the stirrup and the lever abuts on the plate of the latter and forms an interlocking triangle of the two joints and the abutment of the lever, substantially as set forth.

3. In a weighing-machine, the combination of a scale-beam consisting of a medial part, a lineal extension at one end thereof forming a balance-arm, and two parallel extensions at the other end thereof forming graduated arms and connected at their terminal extremities by a separable bolted joint, a sliding weight on each of said three arms, a knife-edged trunnion on said medial part, means of suspending said beam on said trunnion and means of suspending the object to be weighed from said medial part out of the vertical line of the said trunnion, substantially as set forth.

In testimony whereof I hereunto affix my signature in presence of two subscribing witnesses.

. D. J. CAMPBELL. Witnesses:

A. HARVEY, M. MAoAULAY. 

